Mh light would be the "proper" one to use during veg but the hps will work fine. Running your lights 12 hrs on 12 hrs off will flower them if you are growing photoperiod plants. I take it you are gonna be using clones for the SOG? I think i read that dresser is around 3ft tall. Thats without your light and the pots youll be using. What im getting at is you will have very little vertical space to work with. You might be better off lsting a couple plants so you can keep them low. Thats just my 2cents